Differential diagnosis of coronavirus disease 2019 from community-acquired-pneumonia by computed tomography scan and follow-up.

During the early stage of the disease (within seven days), the total number of leukocytes in the observed patients with COVID-19 was normal, low (< 4 × 10 9 /L), or showed a decreasing trend, which is similar to that reported in the literature [ 21 ] and may be caused by a decrease in lymphocytes during the first few days after infection.

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